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通过试验对钢梁-混凝土板组合桥梁的结构鉴定、基于修正模型的承载力、承载力对分析模型的敏感性进行分析。基于振型、频率、振型阶次等动力性能及静力变形,建立修正模型。用二维梁模型成功模拟了纵梁间横向荷载传递机理、扭转变形及斜桥影响。算得的承载力结果与三维有限元分析接近,而简化的一维杆模型误差却很大。在模型修正的不同阶段,将模型参数分组,这样能提高收敛速度和成功率。虽然可认为横向支撑不参加工作,但在承载力分析中它们却是临界杆。横向支撑的破坏改变了纵梁间的传力机理,可能导致内梁的过早破坏。
Through the experiment, the structural identification of the steel-concrete composite bridge is analyzed, and the sensitivity of the analysis model based on the bearing capacity and bearing capacity of the modified model is analyzed. Based on the vibration mode, frequency, mode shape and other dynamic performance and static deformation, the establishment of a modified model. The two-dimensional beam model is used to simulate the transverse load transfer mechanism, torsional deformation and the influence of inclined bridge. The calculated bearing capacity results are close to the three-dimensional finite element analysis, whereas the simplified one-dimensional rod model has very large errors. In different stages of model modification, the model parameters are grouped, which can improve the convergence rate and success rate. Although horizontal supports are not considered to be involved, they are critical in the analysis of bearing capacity. The destruction of the transverse support changes the transmission mechanism between the stringers and may lead to premature failure of the inner girder.